I was runing my x10 for its first race this weekend. It is the best engine i ever run. It holds tune all day and no flameouts.
I run it with 192 header, 2045 pipe, rb 6 plug. Air temp. About 30 fahr. Engine temp after 30 minuttes around 190.

But i need more bottom power? Longer header or hotter plug, would that do a big difference or what can i do?